<template>
  <div class="sidebar">
    <el-menu class="sidebar-el-menu" :default-active="onRoutes" :collapse="collapse" background-color="#324157" text-color="#bfcbd9" active-text-color="#20a0ff" unique-opened router>
      <template v-for="item in items">
        <template v-if="item.subs">
          <el-submenu :index="item.index" :key="item.index">
            <template slot="title">
              <i :class="item.icon"></i>
              <span slot="title">{{ item.title }}</span>
            </template>
            <template v-for="subItem in item.subs">
              <el-submenu v-if="subItem.subs" :index="subItem.index" :key="subItem.index">
                <template slot="title">{{ subItem.title }}</template>
                <el-menu-item v-for="(threeItem, i) in subItem.subs" :key="i" :index="threeItem.index">{{ threeItem.title }}</el-menu-item>
              </el-submenu>
              <el-menu-item v-else :index="subItem.index" :key="subItem.index">{{ subItem.title }}</el-menu-item>
            </template>
          </el-submenu>
        </template>
        <template v-else>
          <el-menu-item :index="item.index" :key="item.index">
            <i :class="item.icon"></i>
            <span slot="title">{{ item.title }}</span>
          </el-menu-item>
        </template>
      </template>
    </el-menu>
  </div>
</template>

<script>
import bus from '../common/bus'
export default {
  data () {
    return {
      collapse: false,
      items: [
        /* {
          icon: 'el-icon-s-home',
          index: 'home',
          title: '系统首页'
        }, */
        {
          icon: 'el-icon-s-data',
          index: '3',
          title: '排放数据管理',
          subs: [
            {
              index: 'emissionsData',
              title: '排放数据'
            },
            {
              index: 'form',
              title: '实时数据流'
            },
            {
              index: 'obd',
              title: 'OBD信息'
            },
            {
              index: 'loginInfo',
              title: '登录明细'
            }
            /* {
              index: "3-2",
              title: "三级菜单",
              subs: [
                {
                  index: "three",
                  title: "三级"
                }
              ]
            } */
          ]
        },
        {
          icon: 'el-icon-set-up',
          index: 'Abnormal',
          title: '异常排放管理'
        },
        {
          icon: 'el-icon-truck',
          index: 'CarManage',
          title: '车辆管理'
        },

        {
          icon: 'el-icon-map-location',
          index: 'Monitor',
          title: '实时监控'
        },
        {
          icon: 'el-icon-tickets',
          index: 'sn',
          title: '序列号管理'
        },
        {
          icon: 'el-icon-notebook-2',
          index: 'organizational',
          title: '机构管理'
        },
        {
          icon: 'el-icon-s-order',
          index: 'Account',
          title: '账号管理'
        },
        {
          icon: 'el-icon-monitor',
          index: 'software',
          title: '软件管理'
        }

      ]
    }
  },
  computed: {
    onRoutes () {
      return this.$route.path.replace('/', '')
    }
  },
  created () {
    // 通过 Event Bus 进行组件间通信，来折叠侧边栏
    bus.$on('collapse', msg => {
      this.collapse = msg
      bus.$emit('collapse-content', msg)
    })
  }
}
</script>

<style scoped>
.sidebar {
  display: block;
  position: absolute;
  left: 0;
  top: 70px;
  bottom: 0;
  overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
  width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
  width: 250px;
}
.sidebar > ul {
  height: 100%;
}
</style>
